Printing-block for oil-cloth-printing machines.



i No. 693,531r I Patented Apr. 29, |902.

\ E. r. TnETBAn.

PRINTING BLUCK FOB 0II. CLUTI'I PRINTING MACHINES.

(Application med by 2e, 1901.)

(No Model.)

UNITED f STATES PATENT. OFFICE.V

EDWARD F. TRETBAR, OF CAMDEN, NEW JERSEY.

PRINTING-BLOCK FOR OIL-CLOTH-PRINTING MACHINES.

SPECIFICATION forming part of Letters :Patent No. 698,587, dated April 29, 1902.

Application led May 28, 1901. l

T0 all whom t 71mg/ concern: Be it known that I, EDWARD F. TRETBAR,

a citizen of the United States, residing at Camden, county of Camden, and State of New Jersey, have invented a certain new and useful Improvement in Printing Blocks for Oil- Cloth-Printing Machines, 0f which the following is a specification.

My invention relates tol a new and useful improvement :in printing-blocks for eilcloth printing machines, and it relates'to that class of printing-blocks where the top is tacked upon the surface of the block; and the object of my invention is to provide a printing-block which will be constructed of metal and plastic substance, which will prevent said block from warping, and thereby causing the surface upon which the type is secured to become uneven.

A further object of my invention is to provide means for attaching the blocks to the reciprocating framework of the press,which will allow the block'sto be attached more quickly and securely than in devices now in use.

With these ends in View this invention consists in the details of construction and com'- bination of elements hereinafter set forth,and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertainsA may understand how to make and use the same, the con` struction and operation will now be described in detail, referring to the accom panying drawings, forming a part of this specification, in which- Figure l is a bottom plan view of the printing-block, showing a portion of the plastic substance broken away. Fig. 2 is a side elevation of the printing-block, showing the same attached to the reciprocating frame-u Serial Nia. 62,189. (No model.)

of the block, upon the interior thereof, and extending the full length of the block. These ribs are inclined and may be cast in this inclined position or cast vertically andafterward bent over. By inclining these ribs a pocket will be formed between the bottom of the pan and the ribs for the purpose herein after described.

Itis customary i-n securing theltype to printing-blocks to tack the same Aupon one surface of the block. The blocks now in general use are made of wood for this purpose; but, as I have said before, the wood becomes warped, and thus produces an uneven printing-surface, and for the purpose of providing a printing-block which will not warp and yet allow the type to be tacked upon the surface of the same I fill the cavity of the printing block with a plastic substance, such as plaster-of-paris and the like,which will harden, so as to present a ,comparatively solid surface, but allow at the Sametime the type to be tacked upon the same. The plastic substance 'C will enter the pockets formed underneath the inclinedribs B, and by this means the plastic substance will be held within the block. n

Oil-cloth is manufactured and printed in different widths, and when a double width is desired two blocks are placed end to end, and the type upon such blocks will have to join each other perfectly, so as not to showaline where the blocks join. For this reason the type would necessarily have to be nailed very close to the ends of the blocks. To allow for this, I have formed the ends A2 ot the blocks inclined,and these inclined ends Aare planed at the point A3, so that when the two ends of the blocks are brought together they will lie `in close relationfto one another and there willbe'" only a slight line of metal between the two plastic surfaces. `This will allow the type to be tacked very near the edge of the blocks.

In the wooden blocks now in usetheusual manner of securing them to the reciprocating framework of the press is by the use of screws, being screwed into the back of the block. This is very unsatisfactory and, besides, requires considerable time to adjust the blocks in position or remove them from the reciprocating framework. For the purpose of over- IOO coming these disadvantages in my invention I form with the back of the block A vertical ribs A4. These ribs have at certain intervals holes A5 formed therethrough, and the tops thereof are all planed exactly level, so that when they are brought against the under side of the beam D of the reciprocating framework of the press the printing-surface of the block will be level. The beams D of the framework are arranged in pairs, and the holes A5 are formed in the ribs, so that when the block is in position these holes will be in a line directly between each pair of beams, and for this purpose of securing the block to the under side of the beam I provide the screw-rods E, which are formed with hooks E', upon the lower end. These hooks are passed through the holes A5, and a screw-rod E passes upward through yokes F, and the ends of said yokes rest upon the top of the beams D. Nuts G are threaded upon therods E above the yokes F, and thus by turning the nuts G the block A can be drawn tightly against the under side of the beams D, and as the beams D and the block A are each made of materialiwhich cannot warp there will never be any need of adjustment. It will only be necessary to draw the block A tightly against' the beams D to secure the block in perfect printing position.

`Of course I do not wish to be limited to the exact construction here shown, as slight modifcations could be made without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful is- 1. In a printing block, a metallic panshaped framework, longitudinally-inclined ribs formed with said framework and upon the interior of the same, plastic substance filling the interior of the framework, said plastic substance adapted to harden and be held in the framework by the inclined ribs, and means for securing the printing-blocks to the framework of the press, substantially as described and for the purpose specified.

2. In combination with a printingblock consisting of a metallic framework, vertical side walls formed with said framework, inclined end walls formed with said framework, a bottom to which the side walls are secured, said bottom and walls forming a pan-shaped receptacle, a plastic substance filling the receptacle formed by the pan-shaped framework, said plastic substance adapted to harden, means arranged upon the interior of the framework to retain the hardened substance in position, and means for securing the block to the reciprocating framework, substantially as described and for the purpose specified.

3. In combination with a printing-block of the character described, longitudinal ribs formed upon the back of the block, holes formed through said ribs, screw-rods, hooks formed upon the lower ends of said screwrods and adapted to pass through the holes in the ribs, yokes through which the upper ends of the screw-rods are adapted to pass, the ends of said yoke adapted to rest upon the upper surface of the beams composing the framework of the machine, nuts formed upon the upper end of the screw-rods above the yokes for the purpose of drawing the ribs upon the printing-block against the under surface of the beams, substantially as described.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

EDWARD F. 'FRETBAR.

Witnesses:

FRANK J. BURR, HORACE F. SUTTON. 

